Since Trump took office in January, hurling insults and threatening devastating tariffs and U.S. drone strikes, Mexico has been seized by a nationalistic fervor.
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Saint Patrick’s Battalion. The US Army recruited a lot of Irish immigrants as soon as they came off the ships. Many of the Irish were veterans of the British Army and experience was a great asset. When they got to Mexico, they realized they were being asked to fight fellow Catholics for their Protestant generals. Enough deserted and went over to the Mexican side that they were given their own unit.
https://en.wikipedia.org/wiki/Saint_Patrick's_Battalion